Filtering is the process of removing or separating the unwanted part of …
Filtering is the process of removing or separating the unwanted part of a mixture. In signal processing, filtering is specifically used to remove or extract part of a signal, and this can be accomplished using an analog circuit or a digital device (such as a computer). In this lesson, students learn the impact filtering can have on different types of signals, the concepts of frequency and spectrum, and the connections these topics have to real-world signals such as musical signals. Students also learn the roles that these concepts play in designing different types of filters. The lesson content prepares students for the associated activity in which they use an online demo and a variety of filters to identify the message in a distress signal heavily corrupted by noise.
Students learn the basic principles of filtering as well as how to …
Students learn the basic principles of filtering as well as how to apply digital filters to extract part of an audio signal by using an interactive online demo website. They apply this knowledge in order to isolate a voice recording from a heavily noise-contaminated sound wave. After completing the associated lesson, expect students to be able to attempt (and many successfully finish) this activity with minimal help from the instructor.
Finding common ground helps students make informed decisions to conserve temperate forests …
Finding common ground helps students make informed decisions to conserve temperate forests in the United States and central China, habitat of the endangered giant panda. Through classroom activities, on-line simulations, and field investigations students learn about the important role temperate forests play in local and global ecosystems. Action steps culminate in a Class Conservation Action Plan. In the course of this curriculum students locate the biome in which they live, explore a local habitat, and conduct a biological inventory to assess habitat health and natural and human impacts to this habitat; explore the temperate forest biome through A Walk in the Forest, a virtual forest field study, and through hands-on field studies in a local forest or woodland; examine flora and fauna from the two most biodiverse temperate forest regions, central China and Appalachia, and monitor the impacts of habitat loss and degradation on forest organisms and biodiversity; design the optimal zoo habitat; put their knowledge into action by creating their own Class Conservation Action Plan, building on artifacts in their Habitat Journals and Action Plan Portfolios.
In this activity, the students will investigate a variety of plants and …
In this activity, the students will investigate a variety of plants and animals common to the Amazon through research. They will determine the plant or animal characteristics that make them edible or useful for the trip and learn to categorize them by comparing similarities and/or differences.
Discussing environmental issues can be a pivotal part of a student’s environmental …
Discussing environmental issues can be a pivotal part of a student’s environmental education. Thinking about complex issues while engaging in respectful discussion is an opportunity for students to develop skills that are important throughout life. In this activity, students discuss the question, “Should humans stop wildfires?” At first, students typically respond, “Yes! Fires are bad!” In reality, fire management is a challenging environmental management problem, and the question has no simple answer. To make actual fire policy decisions you need a thorough analysis of the impacts of fires—which are not all bad!—on different ecosystems. You also need to think about the usefulness, cost, and effects of different management approaches and solutions.
This video segment adapted from NOVA explains how the sprinkler revolutionized fire …
This video segment adapted from NOVA explains how the sprinkler revolutionized fire safety and also features developments in fire-safety design for high-rise buildings.
These lesson plans delve deep into the pivotal event of the 1878 …
These lesson plans delve deep into the pivotal event of the 1878 Fireburn, a very significant labor uprising in the Virgin Islands, rooted in struggles for human and labor rights. The Fireburn remains a testament in Virign Islands history of the courage of estate laborers such as Mary Thomas, Axeline Salomon, Mathilde McBean, and Susanna Abramson. The students will be taken through the socio-political landscape of the former Danish West Indies through interactive activities, multimedia resources, and critical discussions that understand the events leading up to the uprising and its profound aftermath. This module is to be designed with the purpose of educating but, at the same time, encouraging pride and recognition from those who sacrificed so much by standing up against their own oppression and daring to imagine a more equitable life,, giving way to the current freedoms that exist today in the Virgin Islands of the United States.
Students further their understanding of the salmon life cycle and the human …
Students further their understanding of the salmon life cycle and the human structures and actions that aid in the migration of fish around hydroelectric dams by playing an animated PowerPoint game involving a fish that must climb a fish ladder to get over a dam. They first brainstorm their own ideas, and then learn about existing ways engineers have made dams "friendlier" to migrating fish, before being quizzed as part of the game.
To become familiar with the transfer of energy in the form of …
To become familiar with the transfer of energy in the form of quantum, students perform flame tests, which is one way chemical engineers identify elements by observing the color emitted when placed in a flame. After calculating and then preparing specific molarity solutions of strontium chloride, copper II chloride and potassium chloride (good practice!), students observe the distinct colors each solution produces when placed in a flame, determine the visible light wavelength, and apply that data to identify the metal in a mystery solution. They also calculate the frequency of energy for the solutions.
Students are introduced to the important concept of density with a focus …
Students are introduced to the important concept of density with a focus is on the more easily understood densities of solids. Students use different methods to determine the densities of solid objects, including water displacement to determine volumes of irregularly-shaped objects. By comparing densities of various solids to the density of water, and by considering the behavior of different solids when placed in water, students conclude that ordinarily, objects with densities greater than water sink, while those with densities less than water float. Then they explore the principle of buoyancy, and through further experimentation arrive at Archimedes' principle that a floating object displaces a mass of water equal to its own mass. Students may be surprised to discover that a floating object displaces more water than a sinking object of the same volume.
This lesson introduces students to the important concept of density. The focus …
This lesson introduces students to the important concept of density. The focus is on the more easily understood densities of solids, but students can also explore the densities of liquids and gases. Students devise methods to determine the densities of solid objects, including the method of water displacement to determine volumes of irregularly-shaped objects. By comparing densities of various solids to the density of water, and by considering the behavior of different solids when placed in water, students conclude that ordinarily, objects with densities greater than water will sink, while those with densities less than water will float. Density is an important material property for engineers to understand.
Students discover fluid dynamics related to buoyancy through experimentation and optional photography. …
Students discover fluid dynamics related to buoyancy through experimentation and optional photography. Using one set of fluids, they make light fluids rise through denser fluids. Using another set, they make dense fluids sink through a lighter fluid. In both cases, they see and record beautiful fluid motion. Activities are also suitable as class demonstrations. The natural beauty of fluid flow opens the door to seeing the beauty of physics in general.
Students experience firsthand one of the most common water treatment types in …
Students experience firsthand one of the most common water treatment types in the industry today, flocculants. They learn how the amount of suspended solids in water is measured using the basic properties of matter and light. In addition, they learn about the types of solids that can be found in water and the reasons that some are easier to remove than others. Encompassing the concepts of force and motion, attraction and repulsion of charged particles, and properties of matter, during the associated activity students see scientific concepts they already understand through the eyes of engineers who apply them to the removal of solids from water via chemical flocculants.
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